Endpoint Options
data class EndpointOptions(var preset: Preset? = null, var bindAddr: String? = null, var secretKey: ByteArray? = null, var alpns: List<ByteArray>? = null, var relayMode: RelayMode? = null, var protocols: Map<ByteArray, ProtocolCreator>? = null) : Disposable
Options passed to `Endpoint::bind`.